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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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Weak-Interaction Environment in a Composite Electrolyte Enabling Ultralong-Cycling High-Voltage Solid-State Lithium
Ke Yang1,2, Jiabin Ma1,2, Yuhang Li1,2
1Shenzhen All-Solid-State Lithium Battery Electrolyte Engineering Research Center, Institute of Materials Research (IMR), Tsinghua Shenzhen International Graduate School, Shenzhen 518055, China.
Journal of the American Chemical Society
|April 1, 2024
Summary
Researchers developed advanced solid electrolytes using Poly(vinylidene fluoride) (PVDF) and a novel solvent, 2,2,2-trifluoroacetamide (TFA), enhancing solid-state battery performance and stability.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Poly(vinylidene fluoride) (PVDF)-based solid electrolytes are promising for solid-state batteries.
- Understanding the Li+-interaction environment is crucial for interfacial stability and ion transport.
Purpose of the Study:
- To clarify the microstructure of PVDF-based composite electrolytes at the atomic level.
- To demonstrate how the Li+-interaction environment impacts interfacial stability and ion transport.
- To propose a strategy for constructing a weak-interaction environment for improved battery performance.
Main Methods:
- Utilizing 2,2,2-trifluoroacetamide (TFA) as a replacement for N,N-dimethylformamide (DMF) to create a weak-interaction environment.
- Atomic-level analysis of PVDF-based composite electrolyte microstructure.
- Fabrication and testing of solid-state Li||LiNi0.8Co0.1Mn0.1O2 cells.
Main Results:
- The Li+-interaction environment was shown to be critical for interfacial stability and ion transport.
- Replacing DMF with TFA led to abundant Li+ aggregates and inorganic-rich interphases, enhancing interfacial compatibility.
- The novel electrolyte achieved high ionic conductivity (7.0 × 10-4 S cm-1).
- Solid-state cells demonstrated stable cycling over 4900 and 3000 times at different cutoff voltages, with superior stability across a temperature range and high energy density (300 Wh kg-1).
Conclusions:
- A universal strategy of constructing a weak-interaction environment using TFA in PVDF-based electrolytes significantly improves solid-state battery performance.
- The developed electrolytes offer excellent interfacial compatibility, high ionic conductivity, and long-term cycling stability, paving the way for high-energy-density solid-state batteries.
